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Mavic’s road cycling heritage shines Through in the Cosmic Carbone SLs. The storied French company has been building wheels with this rim shape for several years and its design reflects wheel technology of the narrow rim era. It has a narrow brake track and a pointed V-section fairing instead of a bulbous profile. Testers lauded the sensation of forward propulsion when sprinting, but also found the wheels to be more susceptible to skipping off a line when cornering on rough roads.